In London, Alexander Eberlin (Laurence Harvey) is a double agent for both the British and the Soviet intelligence. The British orders him to hunt down Russian spy Krasnevin. He is partnered with British agent Gatiss (Tom Courtenay). He's having a fling with civilian photographer Caroline (Mia Farrow).

This needs to be a paranoid espionage thriller. It's not thrilling. Laurence Harvey is playing the character too coldly. He needs to be scared or something or else the audience won't care. Nobody is rooting for him. I barely know what Caroline sees in him. The story is too stiff and so is the lead.